MANUFACTURERS SIZE ONE SIZE WHICH IS ABOUT 8-10 LACE UP DETAIL ON THE SIDES, CLEAVAGE AND SHOULDERS, THE LACE UP DETAIL DOES NOT COME UNDONE SO CAN NOT BE ALTERED AND IS FAUX. THE SIZES GIVEN ARE JUST A ROUGH GUIDE AS IT DEPENDS HOW TIGHT OR LOOSE YOU PREFER YOUR DRESS TO BE SO PLEASE CHECK YOUR MEASUREMENTS BELOW.. SIZE 8 UNSTRETCHED THE WAIST IS 24" WITH 3" OF GIVE OR STRETCH, FROM THE UNDERARM DOWN IS 19 1/2" WITH 8" OF LACING AT THE SIDES, MANUFACTURERS SIZE O/S CAN ALSO BE WORN WITH JEANS OR LEGGINGS